Gas-lamp.



' tube,

. UNITED sTA'r-Es PATENT OFFICE.

' ERNST DRESLER, on BERLIN-NEUKGLLN, GERMANY, Assreivon To, THE rim; or

EHRIGI-I & GRAETZ, or BERLIN, GERMA Y;

GAS-LAMP.

Specification of Letters mat. P t t d F b, 22, 191

Application filed July 23, 1914. Serial No. 852,555.

To all whom it may concern:

Be it known that I, ERNST DRESLER, a subject of the German Emperor, residing at Berlin-Neukolln, in the Kingdom of Prussia, German Empire, have inventedcertain new and useful Improvements in Gas- Lamps, of which the following is a speci-, fication.

My invention relates to compressed incandescent gas lamps of the inverted type, in which the incandescent body is closely surrounded by a comparatively narrow chimney made of quartz, or the like. By the use of such narrow chimneys surrounding the incandescent body the heat becomes concentrated 1n a high degree, resultlng 1n a better utilization and increase of the temperature of the flame, and thus in an improved light effect. Especially, when the chimney is provided in its bottom with openings for the admission of outside air, the temperature can be greatly increased. But with this type of lamp considerable difiiculties become, after a while, apparent, inasmuch as the superheating of the burner-head and the lower portion of the mixing tube increases to, such an extent that, upon continued use, the flame is forced back into the mixing instead of heating the incandescent body.

The object of my invention is to avoid this superheating, and this object I attain by providing at the lower end of the mixing tube a plurality of ribs, whereby the excessive heat is conducted away from said part of the lamp. But in order not to lose the heat thus withdrawn from the mixing tube, which would be uneconomical. I so arrange said ribs, that their outer ends bear against the inner wall of the lower end of the heater provided for heating the primary air supply, whereby the heat is transmitted to the wall of said heater and thus utilized in heating the primary air which forms part of the position for each size of lamp,

The mixture burns at theburner head 4:

to which is connected the usual incandescent body 5 closely chimneyfi, preferably made of quartz. The chimney Gas shown is supported by the refiector 7 secured to the lamp casing.

side air is admittedjthrough' a series of openings 8 into the heater 9, rising upward 1n the direction of the arrows 10 and 11 and passing through two pipes 12 and 13 leading through" the flue 141, to the air'suction openings 3 of the burner. A set screw 15 is provided for regulating the mixture of air, above referred to. The mixing tube 2 which can bemade in one or. more parts, is provided at its lower end with several ribs 16 resting against the inner wall of the lower portionof the heater 9. The heat radiated by the burner head 4 or the lower portion of the mixing tube, is thus transmitted to the preliminary heating chamber, and the process already described takes place. The

when, the lamp is fed with a mixture which burns completely.

The drawing shows a lamp with one mixing tube and one incandescent mantle, but of course the number of tubes and burners can be increased. It is also possible, for the purpose of a more accurate regulation of the preliminary heating, to arrange the air inlet openings 8 for the air a little higher than shown or farther away from the points where the heat transmitting ribs 16 bear against the wall of the heater. The best for insuring perfect working and high efiiciency, can be ascertained by experiments. It is finally advisable, as shown in the drawing to widen the flue a little at the point at which the ribs 16 are provided, for the purpose of maintaining the largest possible cross-section of passage.

What I claim as my invention and desire to secure by Letters Patent is 1. In an inverted incandescent compressed surrounded by the cylindrical gas lamp of the type described the combina- Y tion with the mixing tube and a heater for heating the primary air admitted to said mixing tube, of heat conducting ribs arranged to transmit heat from the lower end of said mixing tube to said heater.

2. In aninverted incandescent compressed points of contact betweensaid ribs and said- 10 gas lamp of the type described the combiheater. nation with the mixing tube and a heater In testimony whereof I affix my signature for heating the rifinary airdadmitted 10 said in presence of two Witnesses. mixing tube, oi eat con acting ri s arv ranged to transmit heat fromthe lower end ERNST OB' of said mixing tube to said heater, and \Vitnesses: means for admitting outside air to said- HENRY HAsPER, heater, said means being provided near the VVOLDEMAR HAU'PT.

Gopies ofthis patent may be obtained for five cents each, by addressing the Commissioner of; Patents,

Washington, 11.0.? 

